#include<stdio.h>
#include<stdlib.h>
#include<string.h>

//./mycmd -a/-b/-c...
int main(int argc,char *argv[])
{
    if(argc != 2)
    {
        printf("can not execute!\n");
        exit(1);
    }

    //VAL:目前不存在
    printf("获取环境变量：111VAL：%s\n",getenv("111VAL"));


    if(strcmp(argv[1],"-a") == 0)
    {
        printf("hello a!\n");
    }
    else if(strcmp(argv[1],"-b") == 0)
    {
        printf("hello b!\n");
    }
    else 
    {
        printf("default!\n");
    }

    return 0;
}
